Electric bell.



PATENTED AUG. 28, 1906.

.3. B. CRAFT. ELECTRIC BELL.

APPLICATION FILED 00121. 1904.

' armature may be made oi iiat punchings, as-

STATE?) EDWARD B. CRAFT, Ull CHlCAG'O, JLLINOES, ASSZGNUH "lltlU COMPANY, OF Cl'ilUAGO, lLLlNOlS A ELECTRlG Bi ht Letters Patent. F-Patentezi :28, 1906.

Application filed October 21, 1904. Serial No. MEL 87,

i lLLlNQiS.

No. 829,909. Specification of To all whom it may concern.-

Be it known that l, EDWARD B. CRAFT, a citizen of the United States, residing at Chicage, in the county. of Cook and State of lllinois, have invented a certain new and useful improvement in Electric Bells, of which the following is a full, clear, concise, and exact description.

"1y invention relates to an electric bell, and has for its object to provide an improved device which will be light, strong, ellicient in operation, and very cheap and simple to manufacture. In the device of my invention the parts are made as far as possible of of sheet-metal stamnings and punchings, the base being stamped out from a metal plate and having portions struck up therefrom to form a mounting for the armature, an anchorpost for the spring, and ears for engaging and holding the rim of a stamped sheet-metal cover. The iron parts of'the magnet and its sembled, as hereinafter set forth, and the wires from the magnet-helix may be led throughthe base through space which is left in the striking up of the portions thereof before mentioned. The contact-post .may also be made o1 a punching having two upright arms with a bearing for the contact-pin formed by the inner sides of the arms, and a screw for binding the arms together to lock the contactpin in position. I

I will describe my invention by reference to the accompanying drawings, wherein-- Figure l is a view in front elevation of an electric bell embodying my invention with the cap for the base removed. .Fig. 2 is a 1011- gitudinal sectional view on line 2 2 of Fig. 1. Fig. 8 is a cross-sect ional view of the base and the mechanism carried thereby on line 3 3 of Fig. i. Fig. t is a similar view on line 4 4 of Fig. 1. Fig. 5 1s a longitudinal sect onal view of the base and its associated apparatus on line 5 5 of Fig. 1 and looking'toward the right in said figure. Fig. 6 is a srnnlar view on line 6 6 or 1 looking toward the left,

and 7 is a detail sectional view oi the binding-post.

- The same characters to designate the same figures oi the drawings.

The base a of the bell-Frame, which is stamped sheet metal, supports an electron iagnet Z), having an armature 52, carrying a ol reference are used 1 parts in each of the l tapper 6 adapted to sound a gong c, mounted upon the neck oi the base, The core of the magnet, which is p er-ably a fiat metal punching, is united with the return pole-piece b at the rear by a heel-piece d. This heel-piece, as shot 1 may comprise a rearward extension I) of the core 0, and two metal strips or fillers 6 b interposed between the said extension and the rear portion. of the return pole-piece, the said. parts being secured together and to the base e'by suitable means, such screws (1 d", (which may pass through the base a, return pole-piece b strips 5 b and core extensio 5) in the order named. "By virtue of the above arrangement 1 am enabled to construct a very ellieient magnet'with very little expense, as all the parts of the magn 1; may be ol iiat punch ings. The armature h of said 111 gnet 7) is adapted to be supported by the base (t and bracket 6 and is also preferably formed of a metal punching. The bracket 0 is struckup from the n'iaterial of the base and a portion thereoi bent back to lie in a plane approximately parallel to that of the base-e the an n'iature I) being pivotally mounted, as shown, between the free end of said braclnit and the base. The armat'ure is adzi pted in its attractive movement to open a switch-contact ineluded serially in the circuit of: the magnet l). The armature may car y a contest-spring f, which when the arnntture retracted will engage an adjustable contact-anvil car ried by the support/' mounted upon, but insulated from, the base a. The spring f is adapted upon'the attraction oi the a'rn'iature b to move out of engagement with anvilf' to open the circuit of mag c Z whereupon the armature would be retracted to close eontactsf. A vibratory niovem ent thus i mparted to the armature and bell-tupper in the well-kn0wn manner.

The supportf for the contact-anvilf" may comprise a base f", carrying upright armsf f, preferably formed integrally therewith and bent inward near the base to lie close together. The contact pin or screw f is adjustably mounted between the inner sides of said. arms, preferably in a bearing formed by sl'vrucleout portions oi ll arms, said portions being screwthreaded to permit adiustment oi the contact-screw pl". it sctserew f is also provided for the arms. passing through the free ends thereof and said arms close togetherto bind the same against the sides of said contact pin or screw, and thus to lock the same in its adjusted position. The support f may be provided with lugs struck down from the base f 3 thereof, said lugs being adapted to enter slots or depressions in the base of the bell to prevent the device from turning. An insulatingwasher is interposed between the support and its lugs and the base of the bell, as shown.

An anchor-post g is struck up from the material of the base a, and a retractile spring g extends from said post to the armature b, said spring being connected with 'the armature preferably by being secured to ahook 9 carried by the spring f, mounted upon the armature 1).

Near the lower extremity of the base a is mounted a pair of binding-posts h h, the binding-post it being insulated from the base and connected with a conductor 1, which passes along the back of the base through the opening a therein made by the formation of bracket 6 and thence to one terminal wire of the helix b of magnet b, the other terminal of said helix being connected with. a conductor 2, which passes out through the opening a in the base and into connection with contactanvil f of spring f. The spring f being con nected by armature b with the base a completes the circuit between the posts 72 it, since post 71 is mounted directly upon the base a. The binding-posts h It may comprise a screw h passing through the base a with a clamping-nut h fitting thereon to hold the screw in place. The clamping-nut h is provided with a lug or lugs 72: 71; upon the bottom thereof, adapted to enter depressions or slots in the base a in opposite sides of the screw It" to lock the screw and nut in position and prevent the same from turning. The screw 7L2 also carries a supplemental bindingnut, as usual, The binding-post 72. is provided in addition to the mechanism just described with insulating-washers h It between the clamping-nut and base and between the head of the screw and base, as shown. The

washer h in the assembly of the parts of the binding-post is engaged by the lugs h" of the clamping-nut 7t" and depressions formed by said lugs in the upper surface thereof, while at corresponding points on the lower surface of the washer portions are struck out to form lugs 72, M, which enter the slots in the base. With this construction the screw and clamping-nut are'lirmly held in place to prevent turning of said screw, and said parts are completely insulated from the base. The base may be provided with a cap 91 of stamped sheet metal adapted to conceal and protect theapparatus mounted upon said base with theexception of the binding-posts h It. Said cap has an outwanlly-extended rim or flange i, adapted to fit closely against the base. An opening i is provided in the cap, through which the tapper-arin may pass, the opening being of sullicicnt size to permit l'rcc movement of the tapper. Ears Ir ll." are strucl; up from the material of the base and are adapted to engage the llange i. of the cap to hold the cap in place. The car 1: may be lo cated in position to engage the rim or flange upon the upper wall of the cap near the middic, while the cars I; It" may engage the flange i upon the lower wall of the cap at opposite ends thereof. In fitting the cap in place the rim or flange upon the lower wall of the cap is first forced under the ears k k and 'a slight pressure applied to the upper wall of the cap to spring the flange or rim upon said wall under the ear Ir.

1 claim 1. In an electric signal device, the combination with a sheet-metal base, of an electromagnet supported thereby comprising a flat punched core, a helix surrounding the core, a flat punched return pole-piece, a heel-piece uniting the core and pole-piece comprising a number of punched metal strips between the;

core and polepiece, said parts being fastened together and to the base, an armature for said. magnet, a bracket struck up from the material of the base and forming a support for said armature, the wires leading to said helix passing through the opening in the base made by the formation of said bracket, and a switch-contact operated by said armature in itsmovement.

2. In an electric signal device, the combination with a stamped sheet-metal base, of an electroinagnet supported thereby, a core for said magnet, a helix surrounding said core, an extension of said core at the rear, a return polc-picce, metal strips between said extension and pole-piece, means for fastening said core extension, strips and pole-piece together and to the base, said parts of the magnet being formed of metal punchings, an armature for said magi'i'et also formed of a metal punching, a bracket struck up from the material of the base, a portion thereof being bent rear wardly into a plane approximately parallel to the base, said armature being pivoted between the free end of said bracket and the base, the wires leading to said helix passing througlr the opening made the formation of said bracket, and contacts operated by the arn'iature in its movement.

3. in an electric signal device, the combination with a sheet-metal base, of an electromagnet carried by the base having a core and return pole-piece formed of metal pn'nchi'ngs, an armature for said magnetgr l' racl;et struck up from the base and bent rcarwardly, the armature being pivoted between the free end of said bracket and the base, the wires leading to said helix passing through the opening made by the formation of said bracket, and

movement.

4. r eetrie signal device, the combinea sheet-metal base, of an electromegnet sup tion with sheet-metal base, of en eleetroported thereby, en armature, core end return magnet carried by the base hevingaoore and pole-piece for said magnet formed er fiat 30' return pole-piece formed of metal punchings, metal punching-s, e bracket struck up from 5 n11arn'uttui'eforsaid megnet,-e bracket struck said base and cooperating therewith in the" up from the base and bent rearwardly, the support of said armature, ahelix surrounding .rinetur'e being pivoted between the free end the core of said magnet, the Wires leading. to

of said breeliet end the base, en enohor-post said helix passing through the opening leftlgy 5v ei'funli up free; the base, it coiled retrectile the formation of said bracket, contacts operepring connecting said post and ermeture, eted by said armature in its movement, a

1d contacts operated by the armature in its tztpper carried by the armature, e gong adept- 2 evement. ed to be struck by seid-tepper, en anchor tion with e sheet-metel base, of en eleetrespring extending from said post to the armagnet supported thereby, an ermature for meture, and a stamped sheet-metal oep fit-- eeie magnet, a. bracket struck up from the ting uponthe base ever the o "ereting parts. meterial of the base and ooepereting with of the bell, said cap bein hefl place by the base to form av pivotal support for sei s ears struck up from seid ierse engaging the 45 armature, e helix for said magnet, the wires rimof said cap.

vlabeling thereto passing throughthe openin In witness-whereof I hereunto subscribe in the base made by the formation ef sei my name this 'Zthjday of September, A. D. bracket, contacts operated by the armature 1904,

111 its movement, ears struck up frem the nmteriel of the base, and a stamped sheet-metal I I 'EDWARD CRAi I 25 cap for said base having a rim adapted to be Witnesses? engaged by said ears to hold said cap in place. EDWIN H. SMYTHE,

6. In an electric bell, the combination with, WILLIAM S. EUNQAN,

e. In enelectrio signal device,"the combinw poet struck up frem said base, a retre otile 4 

